Year	constant 2015 US$
1960	65410000
1961	200170000
1962	642620000
1963	278440000
1964	105090000
1965	234710000
1966	241890000
1967	153340000
1968	91720000
1969	89750000
1970	66520000
1971	61760000
1972	59080000
1973	44190000
1974	57210000
1975	69860000
1976	88920000
1977	99840000
1978	126090000
1979	192400000
1980	220670000
1981	248160000
1982	243170000
1983	263090000
1984	285920000
1985	195900000
1986	184140000
1987	131930000
1988	102790000
1989	94860000
1990	163810000
1991	225520000
1992	156550000
1993	165620000
1994	87060000
1995	146260000
1996	201020000
1997	100340000
1998	97730000
1999	126810000
2000	93570000
2001	54960000
2002	75400000
2003	130410000
2004	246200000
2005	245850000
2006	277630000
2007	1087590000
2008	1163040000
2009	482870000
2010	1307050000
2011	677920000
2012	525600000
2013	490470000
2014	683870000
2015	1097960000
2016	815120000
2017	610400000